Just close answers.
Just close the site and let it die peacefully or do something to make it better. Trolls are everywhere and answers seems to be encouraging them.
Here’s a troll that keeps asking the same question. I reported it with the links for the questions. A few were removed and then restored.
There was a glitch where removing a question would sometimes have it pop up again without an appeal one of my answers was deleted once and came back on its own. I agree if yahoo won't fix the site it should die off and spare us all the frustration